Name stack+tls VMAs with PR_SET_VMA_ANON_NAME
Bionic creates a single thread mapping to hold a thread's stack and static
TLS memory. Use PR_SET_VMA_ANON_NAME to name this region
"stack_and_tls:tid". dumpsys meminfo can report this region as "Stack"
memory.
The main thread's memory is instead named stack_and_tls:main, and the VMA
is renamed to stack_and_tls:main in a post-fork child.
For the main thread, and threads using pthread_attr_setstack, Bionic still
creates the stack_and_tls mapping, but it only has TLS memory in it.
Bug: http://b/134795155
Test: run "dumpsys meminfo" and verify that this CL increases the reported
stack memory usage from about 4MB to 21MB.
Change-Id: Id1f39ff083329e83426130b4ef94222ffacb90ae
Merged-In: Id1f39ff083329e83426130b4ef94222ffacb90ae
diff --git a/libc/bionic/__libc_init_main_thread.cpp b/libc/bionic/__libc_init_main_thread.cpp
index 4984e38..6e1b0de 100644
--- a/libc/bionic/__libc_init_main_thread.cpp
+++ b/libc/bionic/__libc_init_main_thread.cpp
@@ -135,8 +135,11 @@
main_thread.mmap_base = mapping.mmap_base;
main_thread.mmap_size = mapping.mmap_size;
+ main_thread.mmap_base_unguarded = mapping.mmap_base_unguarded;
+ main_thread.mmap_size_unguarded = mapping.mmap_size_unguarded;
__set_tls(&new_tcb->tls_slot(0));
+ __set_stack_and_tls_vma_name(true);
__free_temp_bionic_tls(temp_tls);
}